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Germany: Police seize bitcoins worth €2 billion
(www.dw.com)
This is a most excellent place for technology news and articles.
The total supply is 21 million. But a lot has been lost due to people losing their keys.
How much is difficult to measure, but you can probably take 20% off that number and be somewhat safe.
True. There are some pretty good effort estimates out there, idk what they are, but there are definitely some lost keys.